1 /*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (c) 1996,1998 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: irp_ho.c,v 1.3 2005/04/27 04:56:28 sra Exp $";
20 #endif /* LIBC_SCCS and not lint */
21
22 /* Imports. */
23
24 #include "port_before.h"
25
26 #include <syslog.h>
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/socket.h>
30
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33 #include <arpa/nameser.h>
34
35 #include <ctype.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <netdb.h>
39 #include <resolv.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <syslog.h>
44
45 #include <irs.h>
46 #include <irp.h>
47 #include <isc/irpmarshall.h>
48 #include <isc/memcluster.h>
49
50 #include "irs_p.h"
51 #include "dns_p.h"
52 #include "irp_p.h"
53
54 #include "port_after.h"
55
56 /* Definitions. */
57
58 #define MAXALIASES 35
59 #define MAXADDRS 35
60 #define Max(a,b) ((a) > (b) ? (a) : (b))
61
62
63 struct pvt {
64 struct irp_p *girpdata;
65 int warned;
66 struct hostent host;
67 };
68
69 /* Forward. */
70
71 static void ho_close(struct irs_ho *this);
72 static struct hostent * ho_byname(struct irs_ho *this, const char *name);
73 static struct hostent * ho_byname2(struct irs_ho *this, const char *name,
74 int af);
75 static struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
76 int len, int af);
77 static struct hostent * ho_next(struct irs_ho *this);
78 static void ho_rewind(struct irs_ho *this);
79 static void ho_minimize(struct irs_ho *this);
80
81 static void free_host(struct hostent *ho);
82 static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
83 const struct addrinfo *pai);
84
85 /* Public. */
86
87 /*%
88 * struct irs_ho * irs_irp_ho(struct irs_acc *this)
89 *
90 * Notes:
91 *
92 * Initializes the irp_ho module.
93 *
94 */
95
96 struct irs_ho *
irs_irp_ho(struct irs_acc * this)97 irs_irp_ho(struct irs_acc *this) {
98 struct irs_ho *ho;
99 struct pvt *pvt;
100
101 if (!(ho = memget(sizeof *ho))) {
102 errno = ENOMEM;
103 return (NULL);
104 }
105 memset(ho, 0x0, sizeof *ho);
106
107 if (!(pvt = memget(sizeof *pvt))) {
108 memput(ho, sizeof *ho);
109 errno = ENOMEM;
110 return (NULL);
111 }
112 memset(pvt, 0, sizeof *pvt);
113 pvt->girpdata = this->private;
114
115 ho->private = pvt;
116 ho->close = ho_close;
117 ho->byname = ho_byname;
118 ho->byname2 = ho_byname2;
119 ho->byaddr = ho_byaddr;
120 ho->next = ho_next;
121 ho->rewind = ho_rewind;
122 ho->minimize = ho_minimize;
123 ho->addrinfo = ho_addrinfo;
124
125 return (ho);
126 }
127
128 /* Methods. */
129
130 /*%
131 * Closes down the module.
132 *
133 */
134
135 static void
ho_close(struct irs_ho * this)136 ho_close(struct irs_ho *this) {
137 struct pvt *pvt = (struct pvt *)this->private;
138
139 ho_minimize(this);
140
141 free_host(&pvt->host);
142
143 memput(pvt, sizeof *pvt);
144 memput(this, sizeof *this);
145 }
146
147
148
149 /*
150 * struct hostent * ho_byname(struct irs_ho *this, const char *name)
151 *
152 */
153
154 static struct hostent *
ho_byname(struct irs_ho * this,const char * name)155 ho_byname(struct irs_ho *this, const char *name) {
156 return (ho_byname2(this, name, AF_INET));
157 }
158
159
160
161
162
163 /*
164 * struct hostent * ho_byname2(struct irs_ho *this, const char *name, int af)
165 *
166 */
167
168 static struct hostent *
ho_byname2(struct irs_ho * this,const char * name,int af)169 ho_byname2(struct irs_ho *this, const char *name, int af) {
170 struct pvt *pvt = (struct pvt *)this->private;
171 struct hostent *ho = &pvt->host;
172 char *body = NULL;
173 size_t bodylen;
174 int code;
175 char text[256];
176
177 if (ho->h_name != NULL &&
178 strcmp(name, ho->h_name) == 0 &&
179 af == ho->h_addrtype) {
180 return (ho);
181 }
182
183 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
184 return (NULL);
185 }
186
187 if (irs_irp_send_command(pvt->girpdata, "gethostbyname2 %s %s",
188 name, ADDR_T_STR(af)) != 0)
189 return (NULL);
190
191 if (irs_irp_get_full_response(pvt->girpdata, &code,
192 text, sizeof text,
193 &body, &bodylen) != 0) {
194 return (NULL);
195 }
196
197 if (code == IRPD_GETHOST_OK) {
198 free_host(ho);
199 if (irp_unmarshall_ho(ho, body) != 0) {
200 ho = NULL;
201 }
202 } else {
203 ho = NULL;
204 }
205
206 if (body != NULL) {
207 memput(body, bodylen);
208 }
209
210 return (ho);
211 }
212
213
214
215 /*
216 * struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
217 * int len, int af)
218 *
219 */
220
221 static struct hostent *
ho_byaddr(struct irs_ho * this,const void * addr,int len,int af)222 ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
223 struct pvt *pvt = (struct pvt *)this->private;
224 struct hostent *ho = &pvt->host;
225 char *body = NULL;
226 size_t bodylen;
227 int code;
228 char **p;
229 char paddr[MAXPADDRSIZE];
230 char text[256];
231
232 if (ho->h_name != NULL &&
233 af == ho->h_addrtype &&
234 len == ho->h_length) {
235 for (p = ho->h_addr_list ; *p != NULL ; p++) {
236 if (memcmp(*p, addr, len) == 0)
237 return (ho);
238 }
239 }
240
241 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
242 return (NULL);
243 }
244
245 if (inet_ntop(af, addr, paddr, sizeof paddr) == NULL) {
246 return (NULL);
247 }
248
249 if (irs_irp_send_command(pvt->girpdata, "gethostbyaddr %s %s",
250 paddr, ADDR_T_STR(af)) != 0) {
251 return (NULL);
252 }
253
254 if (irs_irp_get_full_response(pvt->girpdata, &code,
255 text, sizeof text,
256 &body, &bodylen) != 0) {
257 return (NULL);
258 }
259
260 if (code == IRPD_GETHOST_OK) {
261 free_host(ho);
262 if (irp_unmarshall_ho(ho, body) != 0) {
263 ho = NULL;
264 }
265 } else {
266 ho = NULL;
267 }
268
269 if (body != NULL) {
270 memput(body, bodylen);
271 }
272
273 return (ho);
274 }
275
276 /*%
277 * The implementation for gethostent(3). The first time it's
278 * called all the data is pulled from the remote(i.e. what
279 * the maximum number of gethostent(3) calls would return)
280 * and that data is cached.
281 *
282 */
283
284 static struct hostent *
ho_next(struct irs_ho * this)285 ho_next(struct irs_ho *this) {
286 struct pvt *pvt = (struct pvt *)this->private;
287 struct hostent *ho = &pvt->host;
288 char *body;
289 size_t bodylen;
290 int code;
291 char text[256];
292
293 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
294 return (NULL);
295 }
296
297 if (irs_irp_send_command(pvt->girpdata, "gethostent") != 0) {
298 return (NULL);
299 }
300
301 if (irs_irp_get_full_response(pvt->girpdata, &code,
302 text, sizeof text,
303 &body, &bodylen) != 0) {
304 return (NULL);
305 }
306
307 if (code == IRPD_GETHOST_OK) {
308 free_host(ho);
309 if (irp_unmarshall_ho(ho, body) != 0) {
310 ho = NULL;
311 }
312 } else {
313 ho = NULL;
314 }
315
316 if (body != NULL) {
317 memput(body, bodylen);
318 }
319
320 return (ho);
321 }
322
323 /*%
324 * void ho_rewind(struct irs_ho *this)
325 *
326 */
327
328 static void
ho_rewind(struct irs_ho * this)329 ho_rewind(struct irs_ho *this) {
330 struct pvt *pvt = (struct pvt *)this->private;
331 char text[256];
332 int code;
333
334 if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
335 return;
336 }
337
338 if (irs_irp_send_command(pvt->girpdata, "sethostent") != 0) {
339 return;
340 }
341
342 code = irs_irp_read_response(pvt->girpdata, text, sizeof text);
343 if (code != IRPD_GETHOST_SETOK) {
344 if (irp_log_errors) {
345 syslog(LOG_WARNING, "sethostent failed: %s", text);
346 }
347 }
348
349 return;
350 }
351
352 /*%
353 * void ho_minimize(struct irs_ho *this)
354 *
355 */
356
357 static void
ho_minimize(struct irs_ho * this)358 ho_minimize(struct irs_ho *this) {
359 struct pvt *pvt = (struct pvt *)this->private;
360
361 free_host(&pvt->host);
362
363 irs_irp_disconnect(pvt->girpdata);
364 }
365
366 /*%
367 * void free_host(struct hostent *ho)
368 *
369 */
370
371 static void
free_host(struct hostent * ho)372 free_host(struct hostent *ho) {
373 char **p;
374
375 if (ho == NULL) {
376 return;
377 }
378
379 if (ho->h_name != NULL)
380 free(ho->h_name);
381
382 if (ho->h_aliases != NULL) {
383 for (p = ho->h_aliases ; *p != NULL ; p++)
384 free(*p);
385 free(ho->h_aliases);
386 }
387
388 if (ho->h_addr_list != NULL) {
389 for (p = ho->h_addr_list ; *p != NULL ; p++)
390 free(*p);
391 free(ho->h_addr_list);
392 }
393 }
394
395 /* dummy */
396 static struct addrinfo *
ho_addrinfo(struct irs_ho * this,const char * name,const struct addrinfo * pai)397 ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
398 {
399 UNUSED(this);
400 UNUSED(name);
401 UNUSED(pai);
402 return(NULL);
403 }
404
405 /*! \file */
406